![]() ![]() More details about the meaning of these variables can be found in Bangert-Drowns et al. Meta: prompts for metacognitive reflection were given (0 = no 1 = yes) There are 48 rows of data in this dataset.įor illustration purposes, the following variables will be examined as potential moderators of the treatment effect (i.e., the size of the treatment effect may vary in a systematic way as a function of one or more of these variables): Variable yi contains the effect size estimates (standardized mean differences) and vi the corresponding sampling variances. We can look at the first 10 and the last 10 rows of the dataset with: (I copy the dataset into dat, which is a bit shorter and therefore easier to type further below). (2004) on the effectiveness of school-based writing-to-learn interventions on academic achievement ( help(dat.bangertdrowns2004) provides a bit more background on this dataset). For the example, I will use data from the meta-analysis by Bangert-Drowns et al. ![]()
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